.content {
  position: fixed;
  z-index:99 ;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0,0,0,.5);
}
.p {
  position:absolute;
  width: 100%;
  z-index: 999;
  background-color: #fff;
}
.hide {
  overflow: hidden;
}